The design of your duct work is critical for proper performance of your heating and cooling equipment A less expensive system with a proper duct design often performs better than a high SEER system with a poor duct design You will have much higher heating and cooling utility bills with a poor duct design Your …

1. Upfront ACCA Manual J, S & D Pricing for 3, 5 & 10-Day turnaround: www.load-calculations.com
ACCA Manual J, S & D Resource Directory website: www.acca-manual-j.org
Residential ACCA Manual J load
calculations | ACCA Manual S
equipment verification | ACCA Manual
D duct designs
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Complete Residential ACCA Manual J Load Calculations,
ACCA Manual S Equipment Verification and ACCA Manual D
Duct Design Services
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#1 Provider of Residential ACCA Manual J HVAC Load Calculations in the United States since 2005! We only use
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calculations and ACCA Manual D duct designs for residential homes

2. The Third Step – Sizing HVAC Supply & Return Duct Work Properly Using ACCA Manual D
Duct Design
So you are getting ready to replace an old HVAC system or perhaps you are building your new dream home.
Before making that purchase or even selecting the installing contractor, there are three important factors
to investigate to ensure optimum comfort in your home for many years to come. This blog addresses the
3rd step – ACCA Manual D Duct Sizing.
Why do EnergyStar, LEED, CALGreen, and many permit offices insist on ACCA Manual D duct sizing for your
supply and return duct work? Because Manual D duct design has a proven track record over many decades
just like the Manual J & Manual S. If your HVAC designer uses proper duct sizing techniques:
• Layout of your home
• Room x room heating and cooling needs based on your ACCA Manual J results
o Ensures the correct heating and cooling is supplied resulting in the desired temperature
• Appropriate register sizes based on Manual T air distribution
• Proper supply and return main plenum size based on velocity and friction rate
o Too high a velocity will produce noise issues
o Some contractors use the same size branch duct to all rooms while the bath needs very little
conditioning and the bedroom requires 2-3 times as much
ACCA Manual D Duct Sizing is the third important step to achieving a proper, quality HVAC
installation for optimum performance. If the duct work (air distribution system) is
improperly installed, each room will get varying amounts of comfort and can result in great
discomfort and disappointment in your New Comfort System.
Duct work that is too large will result in rooms becoming uncomfortable - This duct work is TOO Big! Duct
work that is too small will increase your utility bills and perform inefficiently – This duct work is TOO Small!
Avoid having GoldiLocks ductwork. Confirm your HVAC Designer uses ACCA Manual D software and theory
to size your duct work. You are investing a lot of your hard earned $$$ - with proper heat loss/gain results
(Manual J), you can select a properly sized system (Manual S), and proper duct sizing (Manual D). Then
your Comfort System will be Just Right!
Also Read: The First Step -Make Sure Your HVAC System is Sized Correctly using ACCA Manual J Load
Calculations
Also Read: The Second Step – Select Efficient and Properly Sized Heating and Cooling Equipment using
ACCA Manual S Equipment Selection

3. Author Resource: www.load-calculations.com 801-949-5337
Savoy Engineering Group offers ACCA Certified Manual J8 Load
Calculations, Manual S HVAC equipment selection and Manual D Duct
Design services performed by Masters level engineer utilizing the ACCA
Certified WrightSoft Universal software based on Manual J8. Savoy
Engineering Group has been providing Manual J, S & D service since 2005
and has completed thousands of HVAC design projects throughout the US, Canada and International. We
are Fast, Accurate and Affordable!